JPH1082203A - Vibration damper for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a vibration damper for a building easily at low cost, to eliminate the need for maintenance including repair after an earthquake and to reduce the quakes and vibrations of the building, mainly a frame at the time of the earthquake and the time of a strong wind. SOLUTION: A pair of brackets 5, 6 are fixed downwards onto the underside of a beam C on the upper side in response to the length of laminated springs 2, and spring eyes at both ends of the master plates of the laminated springs 2 are hung from the lower ends of each bracket respectively through shackles or links. Gusset plates 7 are fixed downwards onto the beam C on the upper side while being adjoined to the brackets 6 far from columns B, and the apices of approximately triangular amplifying link plates 4 are supported pivotally and connected to the hinge pads 2c of the laminated springs 2 while one corner sections of the short sides of the amplifying link plates 4 are supported rotatably and coupled at the lower end sections of the gusset plates 7. Other brackets 8 are fastened upwards at places adjacent to the columns B of a beam C on the lower side, and both end sections of braces 3 are supported pivotally and joined at the upper end sections of the brackets 8 and the other comer sections of the short sides of the amplifying link plates 4 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device which is incorporated in a frame of a building to control shaking and vibration of the building due to an earthquake, a strong wind, or the like. This damping device
It is suitable mainly for buildings made of steel frame, reinforced concrete, and steel reinforced concrete, and is applicable to low-rise to high-rise and super-high-rise buildings.

[0002]

2. Description of the Related Art Conventionally, in a structural design of a building against an earthquake or the like, an "earthquake-resistant" design method has been mainly used.
The concept of "seismic isolation" or "vibration suppression" that suppresses or controls seismic force and prevents its energy from being transmitted directly to buildings has been introduced and put into practical use. The "seismic isolation structure" is effective during a large earthquake, while the "damping structure" is effective during strong winds or small and medium-sized earthquakes.

[0003] The vibration damping structure is largely divided into two types: active vibration damping and passive vibration damping. Active vibration suppression is a method of reducing the response of a building by using the control force obtained by a device having a power source.1) The cost for configuring the system is high, and 2) the vibration control system is maintained for many years. And maintenance is required to ensure reliability. On the other hand, passive vibration suppression is a method of reducing the response of a building without applying external force, and there are a method of installing an additional vibration system and a method of incorporating an energy absorbing mechanism. The former is effective for relatively steady external forces such as wind, but cannot be expected for unsteady external forces such as earthquakes. The latter includes a speed proportional damper that generates a force proportional to the deformation speed of a viscous material or the like, and a hysteretic damper that uses a restoring force characteristic of a steel material or the like.

As shown in FIG. 10, a steel damper, which is one of the hysteresis dampers, is provided between the upper and lower beams C and C and the right and left columns B and B on each floor of a high-rise building A made of steel. The upper surface of the steel damper 51 is fixed at an intermediate position in the longitudinal direction of the upper beam C. The lower surface of the steel damper 51 and the corners of the floor beam C and the left and right columns B are respectively provided. Gusset plates 52 and 53 are fixedly provided, and have a structure in which both ends of a brace 54 are pivotally connected between a gusset plate 55 on the steel damper side and gusset plates 52 and 53 on the left and right columns. The steel damper 51 is formed of mild steel, and the vertical plates 51c are connected by welding between the upper plate 51a and the lower plate 51b in the vicinity of both sides, respectively, and the vertical plates 5c are perpendicular to the center between the vertical plates 51c.
1d is connected by welding.

As shown in FIG. 11, a viscous damper 61, which is one of the speed proportional dampers, is filled with a highly viscous liquid 63 in a steel plate upper end open container 62 constituting an outer wall. T-shaped member 64 made of steel plate constituting the inner wall
Is inserted into the high-viscosity liquid 63, and when the T-shaped member 64 moves in the high-viscosity liquid 63 during an earthquake, a resistance force proportional to the deformation speed of the building A is generated, and the seismic force is absorbed.
Building damage is prevented.

In addition, there are chained mass dampers and hybrid mass dampers.

As shown in FIG. 12, the chained mass damper is installed on the roof of a building A and has a weight (additional weight) 71 movably mounted thereon, a spring 72 for resisting the movement of the weight 71, and a damping member. It has a structure provided with the device 73 in parallel.
Then, at the time of the earthquake, the weight 71 vibrates at a cycle equal to the cycle of the building A, and a force in a direction opposite to the speed of the building A is applied from the weight 71 to the building A.
Is added to

[0008] As shown in FIG. 13, the hybrid mass damper is installed on the roof of a building A, and a weight (additional weight) 81 movably mounted, a spring 82 resisting the movement of the weight 81, and a damping device 83 and an actuator 84 in parallel. Then, during the earthquake, the weight 81 vibrates at a cycle equal to the cycle of the building A, and a force in a direction opposite to the speed of the building A is applied from the weight 81 to the building A, and at the same time, the force is applied to the building A via the actuator 84. Is added.

[0009]

However, the various conventional vibration damping devices described above have the following problems.

The steel damper needs to be replaced because the characteristic as the damper deteriorates due to the repeated load and the steel damper may be damaged when an earthquake occurs.

The viscous damper has a high temperature dependency,
The characteristic as a damper changes with temperature. Since the highly viscous liquid deteriorates with time, it must be replaced periodically, which increases the running cost and the initial cost.

[0012] The chained mass damper and the hybrid mass damper have a small vibration damping effect against an earthquake,
It is necessary to synchronize the cycle of the building and the weight, maintenance is difficult, and a large space is required for installing the device. Particularly, in the case of the hybrid mass damper, a large power consumption is required because the actuator is used.

The present invention has been made in view of the above points, and can be manufactured easily and inexpensively, does not require maintenance including repair after an earthquake, and mainly shakes a frame of a building during an earthquake or a strong wind. It is an object of the present invention to provide a building damping device capable of reducing vibration and vibration.

[0014]

In order to achieve the above object, a vibration damping device for a building according to the present invention comprises: a) a steel frame structure, a reinforced concrete structure, a steel frame reinforced concrete structure, and the like. A vibration damping device attached between upper and lower beams, b) a pair of brackets fixed downward on the lower surface of the upper beam according to the length of the leaf spring, and a lower end of each bracket. At both ends of the parent plate (also called full length spring plate) of the leaf spring are suspended via shackles or links, respectively, and c) adjacent to the bracket farthest from the column The gusset plate is fixed downward to the upper beam, the vertex of the substantially triangular amplification link plate is pivotally connected to the hinge pad of the leaf spring, and one of the short sides of the amplification link plate is connected. D) is pivotally connected to the lower end of the gusset plate, and d) another bracket is fixed upward at a position close to the lower beam pillar, and the upper end of this bracket and the short Both ends of the brace are pivotally connected to the other corner of the side.

According to the vibration damping device of the present invention having the above configuration, for example, when a horizontal force due to an earthquake acts on the foundation, the frame is deformed, and the amplifying link plate is centered on the pivot point with the gusset plate. By utilizing this principle, the hinge pad of the leaf spring is pushed up and down in the vertical direction to amplify the deformation of the leaf spring. Thereby, the energy which tries to deform the building due to the friction between the spring plates is absorbed. As a result, the response (displacement, speed, acceleration) of the building frame is reduced. In particular, since the vibration damping device of the present invention has a simple structure and a small installation space, the installation location of the device in a building is hardly restricted.

According to a second aspect of the present invention, there is provided a vibration damping device for a building, comprising: a) a longitudinal direction between the upper and lower beams of each floor between columns of a frame of a building such as a steel frame, a reinforced concrete structure, a steel frame reinforced concrete structure; B) a vibration control device which is mounted symmetrically with respect to a vertical center line passing through the intermediate position of b), and b) a pair of the vibration control devices at a substantially intermediate position in the thickness direction of the lower surface of the upper beam in accordance with the length of the leaf spring. The brackets are fixed downwards, and both ends of the master plate of the leaf spring are hung at the lower end of each bracket via shackles or links.c) Adjacent to the bracket near the center line in the length direction. The gusset plate is fixed downward to the upper beam, the vertex of the substantially triangular amplification link plate is pivotally connected to the hinge pad of the leaf spring, and the short side (bottom side) of the amplification link plate is One) D) is pivotally connected to the lower end of the gusset plate, and d) a bracket is fixed upward at a position close to the lower beam column, and the upper end of the bracket and the short side of the amplification link plate ( Both ends of the brace are pivotally connected to the other corner of the base), and the upper extension lines of the left and right braces intersect at an intermediate position in the length direction of the upper beam. .

According to the vibration damping device having the above structure, when a horizontal force due to an earthquake acts on the base portion, the frame is deformed, and the left and right amplifying link plates are passed through the braces on both sides of the center line. The levers amplify the displacement of the brace by the principle of leverage around the pivot point with respect to the gusset plate, and push and pull the hinge pad of the leaf spring vertically to amplify the deformation of the leaf spring. Thereby, the energy which tries to deform the building due to the friction between the spring plates is absorbed. As a result, the response (displacement, speed, acceleration) of the building frame is reduced. Claim 2
The vibration damping device is located at the center in the longitudinal direction between the columns,
Since a relatively large space (space) is created as shown in FIG. 1, an opening (e.g., an entrance or a window) can be provided in this space, and the degree of freedom in designing a building is expanded.

According to a third aspect of the present invention, there is provided a leaf spring near an intersection of each of the braces constituting the K shape with the upper beam and a pair of braces, and an amplifying device for amplifying the displacement of the leaf spring. In the event of an earthquake, the energy of the building that acts due to the earthquake is absorbed by the friction between the spring plates of the leaf springs, and the swing of the building can be controlled.

According to this configuration, the same function as that of the vibration damping device according to the second aspect is exerted.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vibration damping device for a building according to an embodiment of the present invention.

The present embodiment is applied to a nine-story building made of steel. As shown in FIG.
Between the left and right pillars B and B at the center of
(However, the vibration damping device 1 is installed between the beam C and the foundation beam D on the first floor).

As shown in FIGS. 2 and 3, the vibration damping device 1 is provided symmetrically with respect to a vertical center line passing through an intermediate position in the longitudinal direction of the beam C. Each damping device 1 includes a leaf spring 2 and
Brace 3 and substantially right triangle triangular amplification link plate 4
And As shown in FIG. 4, the leaf spring 2 is mainly used as a suspension spring for a truck. The leaf springs 2a having different lengths are overlapped so as to gradually increase in length from the bottom, and a hinge pad is provided. 2c
And the pad 2d, and a plurality of tightening bolts 2
e. Both ends of the main plate 2a 'having the longest upper end are wound into eyeballs to form eyeballs 2b as mounting portions.

The center in the length direction of the upper beam C (intermediate position)
In the vicinity, corresponding to the length of the master plate 2a 'of the leaf spring 2,
Triangular brackets 5 and 6 project downward, and the eyeball 2b of the leaf spring 2 is suspended from pin holes in the lower ends of the brackets 5 and 6 via shackles or links 5a and 6a. A substantially triangular gusset plate 7 protrudes downward adjacent to and in parallel with the bracket 6 near the center. Hinge pad 2c of leaf spring 2
The vertex pin hole of the link plate 4 is pivotally connected to the lower end pin hole of the lower end of the link plate 4. The link is pivotally connected, and the shorter hypotenuse of the link plate 4 is horizontally arranged substantially parallel to the beam C.

A triangular bracket 8 protrudes upward near the intersection of the lower beam C and the column B, and a pin hole at the upper end of the bracket 8 and another corner pin hole at the bottom of the link plate 4 are provided. Both ends of the brace 3 are pivotally connected. In this state, the left and right components such as the leaf spring 2, the brace 3, and the link plate 4 are arranged symmetrically with respect to the center line.
The type is composed. An opening E is formed below the intersection of the K-shaped braces 3.3 as shown in FIG. Since the first floor of the building A does not have the lower beam C, the bracket 8 protrudes upward on the foundation beam D. Further, the leaf spring 2, the brace 3, the link plate 4, and the like constituting the vibration damping device 1 are arranged on the center line in the thickness direction of the upper beam C and the lower beam C, respectively. Then, the vibration damping device 1 is usually covered with an outer wall or an inner wall and is not exposed. Symmetrical damping device 1
By installing on the four sides of the building A, respectively, exerts a vibration damping effect against seismic waves and strong winds from each direction.

By the way, in order to verify the vibration damping effect of the vibration damping device 1 of the above-described embodiment, the maximum acceleration is set to 0.
A seismic wave of 26 G (250 cm / sec ² ) was applied to the building A provided with the vibration damping device 1 and the building not provided (not shown), and the displacement, velocity, and acceleration were measured. FIG. 5 is a drawing showing a seismic wave input direction and a shear type 9-mass system analysis model of the building A provided with the vibration damping device 1. As shown in FIG. 5, the vibration damping device 1 includes a spring and a damping device in parallel. In the analysis model provided, the circular part represents the mass of each floor. FIG. 6 is a graph showing the relationship between the acceleration of the input seismic wave and time, and shows the relationship between the period 1.
5 seconds, duration 6 seconds. FIGS. 7A to 7C are graphs sequentially showing each relationship between displacement, velocity, acceleration, and time on the rooftop (RF) of building A. FIG. FIGS. 8A to 8C are graphs sequentially showing the maximum response displacement, the maximum response speed, and the maximum response acceleration in RF from 2F of the building A.

As can be seen from the above graph, the maximum displacement, the maximum speed and the maximum acceleration of the building A provided with the vibration damping device 1 are smaller than those of the building not provided with the vibration damping device 1, and the swing of the building is collected much faster. It is confirmed that. Thereby, the effectiveness of the vibration damping device 1 according to the present example is confirmed.

As described above, the vibration damping device 1 of the present invention has a simple structure, and the leaf spring 2, which is a main component of the vibration damping device 1, can adjust its energy absorbing ability by changing its rigidity and the number of spring plates. It can be applied not only to new buildings but also to existing buildings, and is particularly suitable for steel-framed buildings, and its scale ranges from low-rise buildings to high-rise and super-high-rise buildings. FIG. 9 is a flowchart showing a procedure of installing a vibration damping device in a new building and an existing building.

First, in the case of a new building, at the design stage,
1) Design frame of building A, 2) Design leaf springs. Then, at the construction stage, as shown on the left side of FIG. 9, 1) the leaf spring 2 and the amplification link plate 4 are attached to the lower surface of the beam C via the brackets 5.6 and the gusset plate 7, and the same beam C The bracket 8 is attached to the upper surface of the device by welding or the like. 2) Move the beam C with a heavy machine such as a crane,
The frame is assembled by joining with the pillar B. 3) By mounting the brace 3 between the amplification link plate 4 and the bracket 8, the vibration damping device 1 is completed.

In the case of an existing building, at the design stage, 1) examination of the earthquake resistance of the building A, and 2) designing of a leaf spring. Then, at the construction stage, as shown on the right side of FIG. 9, 1) the brackets 5.6 and the gusset plate 7 for attaching the leaf spring 2 and the amplification link plate 4 to the lower surface of the upper beam C by welding or the like. At the same time, the bracket 8 is attached to the upper surface of the lower beam C by welding or the like. 2) The leaf spring 2 and the amplifying link plate 4 are respectively attached to the upper beam C, and the brace 3 is interposed between the amplifying link plate 4 and the bracket 8, whereby the vibration damping device 1 is completed.

Prior to verifying the vibration damping effect of the vibration damping device 1 described above, the effectiveness of the laminated leaf spring 2 as a main component of the vibration damping device 1 as a single vibration damping device—energy In order to verify the absorption capacity and the restoring force characteristics, etc., a simple simple repeated bending test and a dynamic simple repeated bending test of the leaf spring 2 alone were performed.

Specimens: Five specimens are shown in the table below.

[Table 1] Static loading test: amplitude ± 2.0cm, ± 4.5c
m, ± 7.0 cm and a displacement speed of 10 cm / min, and each amplitude was repeated three cycles. The load was measured using a load cell installed between the test specimen and the crosshead. The displacement was measured using a rotary encoder provided in a tester for measuring the crosshead displacement, assuming that the specimen displacement and the crosshead displacement were equal. Further, from the strain value of the strain gauge attached to each bolt, the tightening axial force of the bolt before and after the load was calculated.

Dynamic loading test: Two types of waveforms, a sine wave and a triangular wave, were targeted, and loading was first performed using a sine wave.
Loading was performed by repeating three cycles at an amplitude of ± 7.0 cm and a frequency of 1.0 Hz.

The measurement of the load was performed by a load cell installed between the test piece and the piston rod. The measurement of displacement is
In order to directly measure the displacement of the specimen, a non-contact displacement meter equipped in the testing machine for measuring the displacement of the piston rod and a visible light laser displacement sensor installed directly below the specimen pad were used. In order to verify the normality of the loading and the measurement, the acceleration was measured by an accelerometer installed on the specimen. The method of calculating the bolt tightening axial force is the same as in the case of the static loading test.

Test results: From the above test, the following became clear.

A) The hysteresis curve shows a stable shape, and the leaf spring has a stable energy absorbing ability.

B) The load-deformation relationship exhibits a linear relationship when loading and unloading, and a non-linear relationship when adding and reversing.

C) As the spring constant increases, the amount of energy absorption tends to increase.

D) As the number of spring plates increases, the amount of energy absorption tends to increase.

E) The hysteresis curves in the static loading test and the dynamic loading test have almost the same shape, and the energy absorption in the dynamic loading test is larger than that in the static loading test. Therefore, the subsequent test can be represented by a static loading test.

Consideration: A) Based on the above characteristic a), the response of the building at the time of an earthquake or the like can be reduced as shown in FIGS.

B) The characteristics of a) and b) described above, that is, the fact that the leaf spring absorbs energy by friction between the spring plates and has the property of an elastic body are used. No maintenance and post-earthquake repairs are required.

C) Based on the above characteristics c) to e), a leaf spring suitable for a building can be easily designed.

Although the embodiment of the vibration damping device for a building according to the present invention has been described above, the vibration damping device of the present invention can be implemented as follows.

1) Since the amplification link plate 4 is used for the principle of leverage, it need not be a substantially right triangle, but may be any triangle or substantially triangle whose base is shorter than the length of the hypotenuse sandwiching the apex.

2) As described above, the number, length, rigidity, and the like of the leaf springs can be appropriately adjusted according to the scale of the building.

3) It is very effective to provide a pair of vibration damping devices symmetrically. However, depending on the structure of the building, the vibration damping effect can be obtained even if one vibration damping device is provided on each floor on one side of the building.

[0047]

As is apparent from the above description,
The building vibration damping device of the present invention has the following excellent effects.

(1) Since a leaf spring is used as a main component for absorbing energy such as an earthquake, it can be manufactured very inexpensively and easily using existing production equipment. No repair is required and no maintenance is required. Since the structure of the device is simple and the installation space is small, the place where the device is installed is not easily restricted, and the present invention can be applied regardless of whether it is a new building or an existing one.

(2) Since energy such as shaking or vibration of a building mainly in the event of an earthquake or strong wind can be reduced by absorbing the energy with a vibration damping device, not only the building framework but also the internal finishing members and the interior can be reduced. Function damage and damage can be prevented. As a result, the asset value of the building is not lost.

(3) Through the amplifying link plate, according to this principle, the deformation of the leaf spring is amplified and energy is absorbed, so that the response of the building due to a low seismic intensity earthquake or the like can be reduced sensitively and reliably.

The vibration damping device according to claim 2 or 3 has the following effects in addition to the above effects. (4) Braces and leaf springs are arranged symmetrically with respect to the vertical center line that passes through the intermediate position in the length direction of the beam, so that when an earthquake occurs, the devices on both sides balance to effect the deformation of the building. Absorbs it. In addition, since a relatively large space (space) is created in the central part in the width direction between the pillars,
Openings (e.g., entrances and windows) can be provided in this space, thereby increasing the degree of freedom in building design.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a building provided with a vibration damping device according to an embodiment of the present invention.

FIG. 2 is a front view showing the vibration damping device according to the embodiment of the present invention.

3 (a) is an enlarged front view showing one of the vibration damping devices shown in FIG. 2, and FIG. 3 (b) is a schematic diagram showing a state in which the vibration damping devices absorb and absorb deformation of a building. .

FIG. 4 is an enlarged front view showing a leaf spring used in the vibration damping device of the present invention.

FIG. 5 is a view showing an input direction of an input seismic wave and a shear-type nine-mass system analysis model of a building A provided with the vibration damping device 1.

FIG. 6 is a graph showing the relationship between the acceleration of an input seismic wave and time.

FIGS. 7A to 7C are graphs sequentially showing each relationship between displacement, speed, acceleration, and time on the rooftop (RF) of building A. FIG.

FIGS. 8A to 8C are graphs sequentially showing the maximum response displacement, the maximum response speed, and the maximum response acceleration in RF from 2F of building A.

FIG. 9 is a flowchart showing a construction procedure of a vibration damping device in a new building and an existing building.

10A and 10B show a steel damper as a conventional technique. FIG. 10A is a front view showing an example of application of a steel damper to a building, and FIG. 10B is a partially enlarged front view showing an attached state of the steel damper. FIG. 10C is a side view and a front view showing details of a steel damper.

11A and 11B show a viscous damper as a conventional technique, FIG. 11A is a front view showing an example of application of a viscous damper to a building, and FIG. 11B is a partially enlarged front view showing an attached state of the viscous damper. FIG. 11C is a perspective view showing a part of a detail of a viscous damper in a cross section.

12A and 12B show a chained mass damper as a conventional technique. FIG. 12A is a schematic front view showing a state in which a chad mass damper is applied to a building, and FIG. 12B is a structure of the chad mass damper. It is an expansion perspective view which shows in detail.

13 (a) and 13 (b) show a hybrid mass damper as a prior art, in which FIG. 13 (a) is a schematic front view showing a building application state of the hybrid mass damper, and FIG. 13 (b) shows the structure of the hybrid mass damper in detail. It is an expanded perspective view shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration control device 2 Laminated leaf spring 3 Brace 4 Amplification link plate 5.6.8 Bracket 7 Gusset plate A Building B Pillar C beam D Foundation beam

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinsuke Namba 12-20 Ikeda-cho, Nishinomiya-shi, Hyogo Nii-gumi Co., Ltd. (72) Inventor Tomohiko Takaya 12-20 Ikeda-cho, Nishinomiya-shi, Hyogo New Igumi

Claims (3)

[Claims] 1. A vibration damping device attached between upper and lower beams of each floor between columns of a frame of a building such as steel frame, reinforced concrete, steel frame reinforced concrete, etc., A pair of brackets are fixed downward according to the length of the leaf spring, and both ends of the parent plate of the leaf spring are respectively suspended at the lower ends of the brackets via shackles or links, and are far from the column. A gusset plate is fixed downwardly to the upper beam adjacent to the bracket, and a vertex of the substantially triangular amplification link plate is pivotally connected to a hinge pad of the leaf spring; One corner of the short side of the plate is pivotally connected to the lower end of the gusset plate, and another bracket is fixed upward to a position close to the lower beam column. A vibration damping device for a building, wherein both ends of a brace are pivotally connected to a portion and the other corner of the short side of the amplification link plate. 2. A vertical center line passing through an intermediate position in the longitudinal direction between upper and lower beams of each floor between columns of a frame of a building such as steel frame, reinforced concrete, steel frame reinforced concrete, or the like. A symmetrically mounted vibration damping device, in which a pair of brackets is fixed downward at approximately the middle position in the thickness direction of the lower surface of the upper beam according to the length of the leaf spring, and at the lower end of each bracket. Attach both ends of the master plate of the laminated leaf spring via a shackle or link, and fix a gusset plate to the upper beam downwardly adjacent to the bracket near the longitudinal center line. , The vertex of the substantially triangular amplification link plate is pivotally connected to the hinge pad of the leaf spring, and one corner of the short side of the amplification link plate is pivotally connected to the lower end of the gusset plate. Then, another bracket is fixed upward to a position close to each pillar of the lower beam, and both ends of the brace are respectively attached to the upper end of this bracket and the other corner of the short side of the amplification link plate. A vibration damping device for a building, which is pivotally connected and configured such that upper extension lines of left and right braces intersect at an intermediate position in a length direction of the upper beam. 3. A vertical center line passing through an intermediate position in the longitudinal direction between upper and lower beams of each floor between columns of a frame of a building such as a steel frame, a reinforced concrete structure, a steel frame reinforced concrete structure, etc. A symmetrically mounted vibration damping device, comprising: a leaf spring near an intersection of each of the braces forming the K shape by the upper beam and the pair of braces; and an amplifying device for amplifying a displacement of the leaf spring. Are installed,
A vibration damping device for a building, wherein an energy of a building acting by the earthquake is absorbed by friction between spring plates of the leaf spring during an earthquake to control shaking of the building.